Accession Number : ADA329291

Title :   Evaluation of the Semipermeable Membrane Device (SPMD) as a Passive In Situ Concentrator of Military Organic Chemicals in Water

Descriptive Note : Final rept. 15 Jul 94-15 Jul 97

Corporate Author : DEPARTMENT OF THE INTERIOR COLUMBIA MO

Personal Author(s) : Petty, J. D.

PDF Url : ADA329291

Report Date : JUL 1997

Pagination or Media Count : 219

Abstract : The data presented in this report demonstrate the utility of the SPMD technique for sequestering environmentally realistic concentrations of OC pesticide residues (i.e., 1 ng/L, 10 ng/L, and 100 ng/L) at water temperatures ranging from I 00C to 260C. The data are indicative of concentration independent sampling rates for the 23 OC pesticides employed in this research. As predicted by both thermodynamic and kinetic considerations, the sampling rates for all 23 OC pesticides increased from l00C to 260C. For most of the 23 OC pesticides studied, a one (1) g triolein SPMD was demonstrated to passively sample over 50 L of water after 16 days exposure at 260C. The sampling rate data presented in the report permit the use of an algorithm for estimating ambient waterborne concentrations of OC pesticides from their corresponding levels in the SPMD samples. Employing this algorithm to estimate the bioavailable (i.e., dissolved) portion of OC pesticides present in a wide array of aquatic systems also requires the determination of the concentration of the OCs present in the sample, knowledge of the length of exposure (in days) and the average temperature during deployment. The accuracy of such estimations can potentially be improved by including a permeation reference compound(s) to correct for biofouling and variations in aqueous flow rates. Such research is being planned at the ECRC.

Descriptors :   *MEMBRANES(BIOLOGY), *BIOLOGICAL CONTAMINATION, *WATER POLLUTION, *PESTICIDES, *SEMIPERMEABILITY, ALGORITHMS, TEMPERATURE, PERMEABILITY, CHEMICALS, WATER, MILITARY EQUIPMENT, ARRAYS, ACCURACY, ESTIMATES, GROUND WATER, FLOW RATE, SAMPLING, ECOSYSTEMS, RANGE(EXTREMES), RESIDUES, AQUATIC BIOLOGY.

Subject Categories : Ecology
      Hydrology, Limnology and Potamology
      Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE